Dual-containment pipe containing fluoropolymer

Abstract

A dual-containment pipe includes a primary pipe and a secondary pipe having an inner peripheral surface that radially supports an outer peripheral surface of the primary pipe with an interstice formed therebetween. The secondary pipe contains fluoropolymer. The primary pipe has a mono-layered structure of static dissipative fluoropolymer, a multi-layered structure with static dissipative fluoropolymer at its innermost layer, or a multi-layered structure with static dissipative PA at its innermost layer and a fluoropolymer layer.

1 . A dual-containment pipe adapted to be installed underground to transport fluid, comprising:
 a primary pipe constructed of a mono-layered static dissipative fluoropolymer; and   a secondary pipe having an inner peripheral surface that is arranged to radially support an outer peripheral surface of the primary pipe with an interstice being formed between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe, the secondary pipe containing fluoropolymer.   
   
   
       2 . The dual-containment pipe according to  claim 1 , wherein
 the secondary pipe has a PA-based multi-layered structure.   
   
   
       3 . The dual-containment pipe according to  claim 1 , wherein
 the secondary pipe has a PE-based multi-layered structure.   
   
   
       4 . The dual-containment pipe according to  claim 1 , wherein
 the secondary pipe has a mono-layered structure of fluoropolymer.   
   
   
       5 . The dual-containment pipe according to  claim 1 , wherein
 the static dissipative fluoropolymer is static dissipative EFEP.   
   
   
       6 . The dual-containment pipe according to  claim 1 , wherein
 the static dissipative fluoropolymer is static dissipative ETFE.   
   
   
       7 . A dual-containment pipe adapted to be installed underground to transport fluid, comprising:
 a multi-layered primary pipe having an innermost layer constructed of a static dissipative fluoropolymer; and   a secondary pipe having an inner peripheral surface that is arranged to radially support an outer peripheral surface of the primary pipe with an interstice being formed between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe, the secondary pipe containing fluoropolymer.   
   
   
       8 . The dual-containment pipe according to  claim 7 , wherein
 the primary pipe has a PA-based multi-layered structure.   
   
   
       9 . The dual-containment pipe according to  claim 7 , wherein
 the primary pipe has a PE-based multi-layered structure.   
   
   
       10 . The dual-containment pipe according to  claim 7 , wherein
 the secondary pipe has a PA-based multi-layered structure.   
   
   
       11 . The dual-containment pipe according to  claim 7 , wherein
 the secondary pipe has a PE-based multi-layered structure.   
   
   
       12 . The dual-containment pipe according to  claim 7 , wherein
 the secondary pipe has a mono-layered structure of fluoropolymer.   
   
   
       13 . The dual-containment pipe according to  claim 7 , wherein
 the static dissipative fluoropolymer is static dissipative EFEP.   
   
   
       14 . The dual-containment pipe according to  claim 7 , wherein
 the static dissipative fluoropolymer is static dissipative ETFE.   
   
   
       15 . A dual-containment pipe adapted to be installed underground to transport fluid, comprising:
 a multi-layered primary pipe having an innermost layer constructed of a static dissipative PA and a fluoropolymer layer; and   a secondary pipe having an inner peripheral surface that is arranged to radially support an outer peripheral surface of the primary pipe with an interstice being formed between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe, the secondary pipe containing fluoropolymer.   
   
   
       16 . The dual-containment pipe according to  claim 15 , wherein
 the primary pipe has a PA-based multi-layered structure.   
   
   
       17 . The dual-containment pipe according to  claim 15 , wherein
 the primary pipe has a PE-based multi-layered structure.   
   
   
       18 . The dual-containment pipe according to  claim 15 , wherein
 the secondary pipe has a PE-based multi-layered structure.   
   
   
       19 . The dual-containment pipe according to  claim 15 , wherein
 the secondary pipe has a mono-layered structure of fluoropolymer.   
   
   
       20 . The dual-containment pipe according to  claim 15 , wherein
 the primary pipe has an internal cross-sectional shape defining a flow area of at least 450 mm 2 .   
   
   
       21 . The dual-containment pipe according to  claim 15 , further comprising
 a leak detection sensor disposed in the interstice between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe.   
   
   
       22 . The dual-containment pipe according to  claim 15 , wherein
 the dual containment pipe is substantially rigid and substantially inelastic.   
   
   
       23 . The dual-containment pipe according to  claim 1 , wherein
 the primary pipe has an internal cross-sectional shape defining a flow area of at least 450 mm 2 .   
   
   
       24 . The dual-containment pipe according to  claim 1 , further comprising
 a leak detection sensor disposed in the interstice between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe.   
   
   
       25 . The dual-containment pipe according to  claim 1 , wherein
 the dual containment pipe is substantially rigid and substantially inelastic.   
   
   
       26 . The dual-containment pipe according to  claim 7 , wherein
 the primary pipe has an internal cross-sectional shape defining a flow area of at least 450 mm 2 .   
   
   
       27 . The dual-containment pipe according to  claim 7 , further comprising
 a leak detection sensor disposed in the interstice between the inner peripheral surface of the secondary pipe and the outer peripheral surface of the primary pipe.   
   
   
       28 . The dual-containment pipe according to  claim 7 , wherein
 the dual containment pipe is substantially rigid and substantially inelastic.